Tap wrench wrench is the most common style is hitting the tail end product, one end fixed size openings for wrenching certain size nut or bolt. Size: 17mm, 19mm, 22mm, 24mm, 27mm, 30mm, 32mm36mm, 41mm, 46mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm after molding at high temperature blueing, hydroxide at high levels sodium and sodium nitrite solution, the temperature above 140 degrees in the steel surface to generate a dense oxide film (Fe2O3 and Fe3O4), different steels have different color, regardless of the roughness; blue film impatience corrosion, it is blue for a dip after anti-rust oil treatment. Root customers also require additional surface treatment. I plant in products, such as the character of the business philosophy, always adhere to demanding product quality, innovative products through (300KN-1600KN) large-scale friction forging presses, and through X-ray detection test, leading international quality. I plant a variety of customized shaped wrench, welcomed the new and old customers to order call us. Long http://www.hbbtglj.com/tzbs/